package com.hongmeng.common.utils.file;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import com.aliyun.oss.OSSClient;
import com.hongmeng.common.core.domain.AjaxResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.FilenameUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import com.hongmeng.common.config.HongMengConfig;
import com.hongmeng.common.constant.Constants;
import com.hongmeng.common.exception.file.FileNameLengthLimitExceededException;
import com.hongmeng.common.exception.file.FileSizeLimitExceededException;
import com.hongmeng.common.exception.file.InvalidExtensionException;
import com.hongmeng.common.utils.DateUtils;
import com.hongmeng.common.utils.StringUtils;
import com.hongmeng.common.utils.uuid.IdUtils;

/**
 * 文件上传工具类
 *
 * @author hongmeng
 */
@Component
@Slf4j
public class FileUploadUtils {
    @Value("${bucket.bucketName}")
    private String bucketName;

    @Value("${bucket.diskName_tmp}")
    private String diskNameTmp;

    @Value("${bucket.url}")
    private String url;

    /**
     * 默认大小 100M
     */
    public static final long DEFAULT_MAX_SIZE = 100 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = HongMengConfig.getProfile();

    public static void setDefaultBaseDir(String defaultBaseDir) {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir() {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload(MultipartFile file) throws IOException {
        try {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String baseDir, MultipartFile file) throws IOException {
        try {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir          相对应用的基目录
     * @param file             上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException       如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException                          比如读写文件出错时
     * @throws InvalidExtensionException            文件校验异常
     */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        return pathFileName;
    }

    /**
     * 阿里云文件上传
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException
     * @throws FileNameLengthLimitExceededException
     */
    public AjaxResult aliyunUpload(MultipartFile file)
            throws FileSizeLimitExceededException, FileNameLengthLimitExceededException {
        //获取真实文件名--带后缀
        String fileName = file.getOriginalFilename();
        String contentType = file.getContentType();
        //后缀格式
        String fileSuffix = null;
        //去除文件名后缀
        if (fileName.contains(".")) {
            fileSuffix = fileName.substring(fileName.lastIndexOf("."), fileName.length());
        }
        //上传文件名
        String uuid = UUID.randomUUID().toString().replaceAll("-", "");
        String uuidUrl = uuid + fileSuffix;
        log.info("上传原文件名为{},格式化文件名为{}", fileName, uuidUrl);
        String downloadUrl = null;
        String fileSize = String.valueOf(FileUtils.checkFileSize(file.getSize(), Constants.FILE_UNIT.KB));
        try {
            //得到输入流
            InputStream inputStream = file.getInputStream();
            OSSClient client = ALiYunUploadUtils.getOSSClient();
            String s = ALiYunUploadUtils.uploadObject2OSS(client, inputStream, bucketName, diskNameTmp, uuidUrl, 1L);
            System.out.println("上传返回结果：" + s);
            if (s==null){
                return AjaxResult.error();
            }
            downloadUrl = url + diskNameTmp + uuidUrl;
            System.out.println("下载地址： " + downloadUrl);
        } catch (IllegalStateException e) {
            log.error(e.getMessage(), e);
            return AjaxResult.error();
        } catch (IOException e) {
            log.info("-----出现IO异常-----");
            log.error(e.getMessage(), e);
            return AjaxResult.error();
        }
        Map<String, String> map = new HashMap<>();
        map.put("fileName", fileName);
        map.put("downloadName", uuid);
        map.put("downloadUrl", downloadUrl);
        map.put("fileSize", String.valueOf(fileSize));
        map.put("contentType", contentType);
        map.put("fileSuffix", fileSuffix.replace(".", ""));
        return AjaxResult.success(map);
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
        return fileName;
    }

    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists()) {
            desc.createNewFile();
        }
        return desc;
    }

    private static final String getPathFileName(String uploadDir, String fileName) throws IOException {
        int dirLastIndex = HongMengConfig.getProfile().length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
        return pathFileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        long size = file.getSize();
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            } else {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file) {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension)) {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }
}
